Radeon HD 4890 1GB vs Radeon HD 6670 (OEM)

Intro

Compare those specs to the Radeon HD 6670 (OEM), which has a core clock frequency of 800 MHz and a GDDR5 memory speed of 1000 MHz. It also features a 128-bit bus, and uses a 40 nm design. It features 480 SPUs, 24 Texture Address Units, and 8 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6670 (OEM)		63 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 127 Watts (202%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4890 1GB should be 95% quicker than the Radeon HD 6670 (OEM) in general, due to its greater bandwidth. (explain)

Radeon HD 4890 1GB		124800 MB/sec
Radeon HD 6670 (OEM)		64000 MB/sec
	Difference: 60800 (95%)

Texel Rate

The Radeon HD 4890 1GB is quite a bit (about 108%) better at texture filtering than the Radeon HD 6670 (OEM). (explain)

Radeon HD 4890 1GB		40000 Mtexels/sec
Radeon HD 6670 (OEM)		19200 Mtexels/sec
	Difference: 20800 (108%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 4890 1GB is superior to the Radeon HD 6670 (OEM), by far. (explain)

Radeon HD 4890 1GB		16000 Mpixels/sec
Radeon HD 6670 (OEM)		6400 Mpixels/sec
	Difference: 9600 (150%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the maximum amount of data (measured in MB per second) that can be moved past the external memory interface within a second. It's calculated by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.